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Advisory ID: SYSS-2015-045
Product: Secure File Sharing
Vendor: Serv-U
Affected Version(s): Serv-U 15.1.2.189
Tested Version(s): Serv-U 15.1.2.189
Vulnerability Type: Insufficient Verification of Data Authenticity (CWE-345)
Risk Level: Medium
Solution Status: Fixed
Vendor Notification: 2015-07-23
Solution Date: 2015-11-04
Public Disclosure: 2015-11-09
CVE Reference: Not assigned
Author of Advisory: Franz G. Jahn, SySS GmbH, https://www.syss.de/advisories/

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Overview:

An email spoofing vulnerability could be identified in the Serv-U Secure
File Sharing application.

The Serv-U Secure File Sharing is described as follows [1]:

"Secure file sharing lets users send files to and request files from
anyone. When deployed in your data center, Serv-U Managed File Transfer
Server provides this popular “ad hoc” file transfer service to your
end-users on your existing infrastructure, and under the control of your
existing security policy."

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Vulnerability Details:

The application allows to enter arbitrary email addresses, subjects and
comments for upload and download request which are sent via email. An
authenticated user of the application can therefore send invitations
from arbitrary email adresses using arbitrary subjects.

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Proof of Concept (PoC):

Use an arbitrary sender email address like CEO@company.com, choose your
prefered subject and add your comment which will become part of the
resulting email.

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Solution:

According to information by Serv-U, a HotFix for the described security
issue is available at [2].

Please contact the manufacturer for further information or support.

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Disclosure Timeline:

2015-07-06: Vulnerability discovered
2015-07-23: Vulnerability reported to vendor
2015-07-30: Reported vulnerabilities again as the vendor did not respond
            to the first e-mail
2015-08-31: Reported vulnerabilities again as the vendor did not respond
            to the first e-mails
2015-09-16: Rescheduling of the publication date in agreement with the
            manufacturer.
2015-11-09: Public release of security advisory on agreed publication
            date

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References:

[1] Serv-U, Secure File Sharing
    http://www.serv-u.com/secure-file-sharing
[2] Serv-U, HotFix for Secure File Sharing
    http://downloads.solarwinds.com/solarwinds/Release/HotFix/SU-v15.1.2-HotFix2.zip
[3] SySS GmbH, SySS Responsible Disclosure Policy
    https://www.syss.de/en/news/responsible-disclosure-policy/

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Credits:


Security vulnerability found by Franz G. Jahn and Philipp Buchegger of
the SySS GmbH.

E-Mail: franz.jahn (at) syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Franz_Jahn.asc
Key ID: 0xD06A14DE
Key Fingerprint: 2D26 E435 DF7F 572D A0C9 1DE8 D5A6 1496 D06A 14DE

E-Mail: philipp.buchegger (at) syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/Materialien/PGPKeys/Philipp_Buchegger.asc
Key ID: 0xBB6747E8
Key Fingerprint: 489F 34EE FA88 27DE 69A0 756B 0658 09F0 BB67 47E8

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Disclaimer:

The information provided in this security advisory is provided "as is" 
and without warranty of any kind. Details of this security advisory may
be updated in order to provide as accurate information as possible. The
latest version of  this security advisory is available on the SySS Web
site.

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Copyright:

Creative Commons - Attribution (by) - Version 3.0
URL: http://creativecommons.org/licenses/by/3.0/deed.en

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